Emails containing terrorist threats against school districts in six cities and counties across the country — including New York City — were all routed through a server in Germany run by a 21-year-old Maine resident, according to reports.

Vincent Canfield, 21, a college dropout currently residing in Romania, was issued a subpoena from the NYPD in connection to the emails — which have threatened schools in New York, Los Angeles, Miami, Houston, Dallas, and Clark County in Nevada, CBS News reported.

The emails resulted in massive cancellations at over 1,000 schools across Los Angeles County on Wednesday.

(JONATHAN ALCORN/REUTERS)

The emails resulted in massive cancellations at over 1,000 schools across Los Angeles County on Wednesday. Authorities in New York City received the same letter with only the location changed, but determined the threats weren’t credible.

Vincent Canfield, 21, a college drop out currently residing in Romania, was issued a subpoena from the NYPD in connection to the emails.

(@gexcolo/via Twitter)

The letter, which claimed to be composed by a “devout Muslim” but referred to Allah with a lower case ‘a,’ said every school in the named county would be targeted with rifle and bomb assaults “and there is nothing you can do to stop it.”

The writer claimed to be a student in the district suffering from “bullying,” “loneliness” and “rejection.”

Subsequent threats in Houston, Dallas and Clark County in Nevada differed slightly but were also determined to also be hoaxes.

In a recorded call to Canfield, an NYPD detective said of the subpoena, “the reason you got three days to respond is because of the severity of it,” CBS reported.

Canfield responded, “I do understand the severity of it. There's some stuff I don't understand on the subpoena and I'd like to understand it before I follow through.”

Authorities in New York City received the same letter with only the location changed, but determined the threats weren’t credible.

(Spencer Platt/Getty Images)

He told the network he can trace the source of the email and he has complied with the NYPD subpoena. He has also received a subpoena from Clark County, to which he has not yet responded.